System and method for multiple usage tooling for pressurized water reactor

Abstract

A system and method for inspecting, repairing and mitigating stress corrosion cracking on a pressure water reactor vessel. The reactor vessel includes inlet nozzles, outlet nozzles, and bottom mounted instrumentations. The method may include removing core barrels in the reactor vessel, installing a radiation shield in the reactor vessel, installing a coffer dam, draining the reactor vessel, lowering a tooling delivery robot into the reactor vessel, attaching the tooling delivery robot at a surface of the reactor vessel, lowering a tool cradle into the reactor vessel, and attaching the tool cradle at the surface of the reactor vessel.

1 . A system for shielding stored internals in a reactor vessel, comprising: 
 a radiation shield positioned within the reactor vessel;    a coffer dam positioned above the radiation shield, and    a working deck having an access lid, the access lid being rotatable with respect to the coffer dam.    
   
   
       2 . The system according to  claim 1 , wherein the radiation shield includes openings, the openings conform with nozzles in the reactor vessel.  
   
   
       3 . The system according to  claim 2 , wherein the radiation shield has a circumference which matches an inner circumference of the reactor vessel.  
   
   
       4 . The system according to  claim 1 , wherein the coffer dam is segmented into a plurality of pieces.  
   
   
       5 . The system according to  claim 4 , wherein the coffer dam is segmented into three pieces.  
   
   
       6 . The system according to  claim 1 , wherein the coffer dam further comprising 
 a coffer dam support for supporting the coffer dam and working deck.    
   
   
       7 . The system according to  claim 6 , wherein the access lid includes a plurality of openings to access an interior of the reactor vessel.  
   
   
       8 . (canceled)  
   
   
       9 . The system according to  claim 1 , further comprising a filter disposed on a coffer dam support for removing airborne particles.  
   
   
       10 . A method of cleaning internals of a reactor vessel, comprising: 
 removing core barrels in the reactor vessel;    installing a radiation shield in the reactor vessel;    installing a coffer dam; and    draining the reactor vessel.    
   
   
       11 . The method according to  claim 10 , wherein the installation of the coffer dam further comprises: 
 providing a working deck; and    installing a coffer dam support for supporting the working deck.    
   
   
       12 . The method according to  claim 11 , wherein the working deck includes an access lid, the access lid including a plurality of openings to access the interior of the reactor vessel.  
   
   
       13 . The method according to  claim 12 , wherein the access lid is rotatable.  
   
   
       14 . The method according to  claim 10 , further comprising installing a filter for ventilating airborne particles in the reactor vessel.  
   
   
       15 . The method according to  claim 10 , further comprising installing protectors for bottom mounted instrumentations.  
   
   
       16 . A system for inspecting, repairing and mitigating stress corrosion cracking on a pressurized water reactor vessel, the reactor vessel including inlet nozzles, outlet nozzles, and bottom mounted instrumentations, comprising: 
 a radiation shield positioned within the reactor vessel;    a coffer dam; positional above the radiation shield    a working deck having an access lid, the access lid being rotatable with respect to the coffer dam;    a tooling delivery robot lowered into the reactor vessel via the access lid; and    a tool cradle for holding tools.    
   
   
       17 . The system according to  claim 16 , wherein the coffer dam further comprising 
 a coffer dam support for supporting the working deck.    
   
   
       18 . The system according to  claim 17 , wherein the rotatable access lid rotates while the tooling delivery robot is lowered into the reactor vessel.  
   
   
       19 . The system according to  claim 16 , wherein the tooling delivery robot engages with the tools to inspect, repair and mitigate stress corrosion cracking in the reactor vessel.  
   
   
       20 . The system according to  claim 16 , wherein the tools is one of a surface improvement tool and a welding machine.  
   
   
       21 . The system according to  claim 16 , wherein more than one tooling delivery robot is lowered into the vessel to cover the area of the bottom mounted instrumentations.  
   
   
       22 . A method for inspecting, repairing and mitigating stress corrosion cracking on a pressurized water reactor vessel, the reactor vessel including inlet nozzles, outlet nozzles, and bottom mounted instrumentations, comprising: 
 removing core barrels in the reactor vessel;    installing a radiation shield in the reactor vessel;    installing a coffer dam;    draining the reactor vessel;    lowering a tooling delivery robot into the reactor vessel;    attaching the tooling delivery robot at a surface of the reactor vessel;    lowering a tool cradle holding tools into the reactor vessel; and    attaching the tool cradle at the surface of the reactor vessel.    
   
   
       23 . The method according to  claim 22 , wherein the installation of the coffer dam further comprises: 
 providing a working deck; and    installing a coffer dam support for supporting the working deck.    
   
   
       24 . The method according to  claim 23 , wherein the working deck includes an access lid, the access lid including a plurality of openings to access the interior of the reactor vessel.  
   
   
       25 . The method according to  claim 24 , further comprising rotating the access lid while lowering the tooling delivery robot into the reactor vessel.  
   
   
       26 . The method according to  claim 22 , wherein the tooling delivery robot engages with the tools in the tool cradle to inspect, repair and mitigate stress corrosion cracking in the reactor vessel.  
   
   
       27 . The method according to  claim 22 , wherein more than one tooling delivery robot is lowered into the vessel to cover the area of the bottom mounted instrumentations.  
   
   
       28 . The system according to  claim 17 , wherein to access lid includes a plurality of openings to access an interior of the reactor vessel.